Process for purifying clay by the hydrothermal conversion of...

C - Chemistry – Metallurgy – 01 – B

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C01B 33/40 (2006.01)

Patent

CA 2315738

A hydrothermal reaction which dissolves the amorphous silica and the crystalline silica impurities contained in a recovered, naturally occuring montmorillonite clay, and subsequently converts the dissolved silicas into a dioctahedral and/or trioctahedral smectite clay. The dissolution of silica is accomplished by adjusting the pH of an aqueous slurry of the recovered clay to a value of about 8.5 to about 10.0, preferably about 9.0 to about 9.5, at a temperature of at least about 150 ~C, preferably about 180 ~C to about 250 ~C, more preferably about 190 ~C to about 235 ~C. Dissolved silica reacts with stoichiometric amounts of aluminum and/or magnesium and/or sodium added to the slurry, while at a temperature of at least about 150 ~C, preferably about 185 ~C to about 250 ~C, and at a pressure of at least about 200 bars, to synthesize a dioctahedral smectite clay from the dissolved silica; or the dissolved silica reacts with stoichiometric amounts of lithium and/or magnesium and/or sodium added to the slurry, at the same conditions, to form a trioctahedral smectite clay.

L'invention concerne une réaction hydrothermale dissolvant la silice amorphe et les impuretés de silice cristallines contenues dans une argile naturelle de montmorillonite récupérée, et convertissant par la suite les silices dissoutes en argile smectique dioctaédrique et/ou trioctaédrique. On effectue la dissolution de la silice en ajustant le pH d'une pâte fluide aqueuse de l'argile récupérée à une valeur comprise entre 8,5 et 10,0 environ, de préférence entre 9,0 et 9,5 environ, à une température d'au moins 150 ·C, de préférence comprise entre 180 ·C et 250 ·C et idéalement entre 190 ·C et 235 ·C. La silice dissoute entre en réaction avec des quantités stoechiométriques d'aluminium et/ou de magnésium et/ou de sodium ajoutées à la pâte fluide, à une température d'au moins 150 ·C environ, de préférence comprise entre 185 ·C et 250 ·C environ et à une pression d'au moins 200 bars environ, pour synthétiser une argile smectique dioctaédrique à partir de la silice dissoute; ou alors, la silice dissoute entre en réaction avec des quantités stoechiométriques de lithium et/ou de magnésium et/ou de sodium ajoutées à la pâte fluide, dans les mêmes conditions, pour former une argile smectique trioctaédrique.

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